How far is Decatur, IL from Oak Forest, IL?
The driving distance from Decatur, IL to Oak Forest, IL is about 159.1 miles (256.1 km), with a travel time of about 02h 59m by car.
- The straight-line flight distance is about 137.3 miles (220.9 km).
- For a round trip, plan for roughly 05h 58m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM CDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 02h 59m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Human settlement in Iroquois County, Illinois, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Driving Route Map
The map below follows the saved road route between Decatur and Oak Forest.
Turn-by-Turn Driving Directions
Step-by-step road directions between Decatur and Oak Forest.
-
1
Start on East Wood Street
155 m · 23 sec · East Wood Street
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2
Turn left onto South Franklin Street
2129 ft · 46 sec · South Franklin Street
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3
Continue on North Water Street
4 mi · 6 min · North Water Street
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4
Take the ramp slight right toward I 72 East: Champaign
2373 ft · 1 min
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5
Merge slight left
40.4 mi · 44 min
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6
Take the exit slight right toward I 57 North: Chicago
1520 ft · 43 sec
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7
Merge slight left
106.9 mi · 1 hr 55 min
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8
Take the exit slight right toward Vollmer Road
1475 ft · 42 sec
-
9
Keep slight left to continue on Vollmer Road West
159 m · 17 sec
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10
Turn right onto Vollmer Road
1892 ft · 40 sec · Vollmer Road
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11
Turn left onto Cicero Avenue
5.2 mi · 8 min · Cicero Avenue
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12
Turn left onto West 159th Street
2707 ft · 55 sec · West 159th Street
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13
Continue on West 159th Street
620 ft · 30 sec · West 159th Street
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14
Turn right
19 m · 10 sec
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15
Turn left
36 m · 9 sec
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16
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Decatur and Oak Forest.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 57 North
Merge slight left
107 mi · 01h 55m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Showers And Thunderstorms Likely leaving Decatur and Showers And Thunderstorms Likely near Oak Forest.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Decatur to Oak Forest?
The road trip is about 159.1 miles (256.1 km) and usually takes 02h 59m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Buckley is a useful midpoint, sitting about 79.6 miles from Decatur and 79.5 miles from Oak Forest.
How much longer is the road route than the straight-line distance?
The direct path is about 137.3 miles (220.9 km), while the road route adds roughly 21.8 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 8:00 AM to 10:00 AM CDT. If you want a more comfortable same-day return, try to leave by 12:32 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $21.16 one way or $42.31 round trip. Estimated CO2 is about 49.9 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms Likely around Decatur and Showers And Thunderstorms Likely near Oak Forest.
Stop Ideas Near Buckley
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Buckley.
Gilman
Rantoul
Illinois Terminal
Pontiac station
Flight Path Map
This map shows the direct air route between Decatur and Oak Forest. Straight-line distance: 137.29 mi (220.95 km).
#1 Decatur
The most populous city in Macon County, Illinois.
| Population | 70,007 |
| Coordinates | 39.8403100, -88.9548000 |
| Altitude | 205 |
| Country | United States |
#2 Oak Forest
City in Cook County, Illinois
| Population | 26,884 |
| Coordinates | 41.6028100, -87.7439400 |
| Altitude | 205 |
| Country | United States |
End: Oak Forest (-87.74394, 41.60281)
Estimated Travel Time
Distance: 256 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 18m |
| 40 mph (64.37 km/h) | 03h 58m |
| 50 mph (80.47 km/h) | 03h 10m |
| 60 mph (96.56 km/h) | 02h 39m |
| 70 mph (112.65 km/h) | 02h 16m |
| 80 mph (129 km/h) | 01h 59m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $21.16 | $42.31 |
| Mid-grade | $4.25 | $23.86 | $47.72 |
| Premium | $4.65 | $26.11 | $52.22 |
| Diesel | $5.30 | $29.76 | $59.51 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Illinois · Apr 24, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.